Help needed with second grade math problem (Page 3)

Forum guidelines BT super discount
Other Resources My Cup of Joe » Help needed with second grade math problem Rss Feed  
Moderators: k9car363, the bear, DerekL, alicefoeller Reply
 
 
of 3
 
 
2008-09-25 6:27 PM
in reply to: #1697037

User image

COURT JESTER
12230
50005000200010010025
ROCKFORD, IL
Subject: RE: Help needed with second grade math problem
froglegs - 2008-09-25 4:37 PM

oops, it is actually 9.

 

I see variations (starting vertical) of the left 2 on the bottom row which indicates more than 9 routes.

2008-09-25 6:31 PM
in reply to: #1697124

User image

Sensei
Sin City
Subject: RE: Help needed with second grade math problem
1stTimeTri - 2008-09-25 3:15 PM
MomX3 - 2008-09-25 3:18 PM

Why did my whole thread just disappear when I hit the TAB key?

 Anyway, I need help on this problem.  I'm not giving my daughter the answer, I'm just curious if I'm even thinking about it right.  Scary since I was a second grade teacher!

 

Charley the spider (S) can only move up or across ot get the fly (F).  How many paths altogether are there for Charley to get his meal?

 

O     O     F

O     O    O

S     O     O

 

I'm not sure if I'm putting too much thought into it by letting the spider take less direct routes?  What do you guys think?

 

I say 0, because the spider and fly are both killed by flyswatter before the spider has a chance to move.

Or if the pattern is on fly paper, it ain't going anywhere.

 

Yes, long day.

2008-09-25 6:46 PM
in reply to: #1697269

User image

Expert
1379
1000100100100252525
Woodland, California
Subject: RE: Help needed with second grade math problem
tupuppy - 2008-09-25 4:27 PM
froglegs - 2008-09-25 4:37 PM

oops, it is actually 9.

 

I see variations (starting vertical) of the left 2 on the bottom row which indicates more than 9 routes.

 

Please explain!!  I don't see it.

2008-09-25 7:04 PM
in reply to: #1696834

User image

Expert
1060
10002525
Weymouth, MA
Subject: RE: Help needed with second grade math problem

puellasolis - 2008-09-25 4:34 PM Assuming that the spider can pass through each point only once (that is, he can't double back on a route), I get nine.

Since this is math and I can't say "+1" or "x2" I'll just go with "agreed".

2008-09-25 8:00 PM
in reply to: #1697254

User image

Elite
3201
20001000100100
South Florida
Subject: RE: Help needed with second grade math problem

jsnowash - 2008-09-25 7:22 PM I just gotta say... that's some seriously tough math for second graders! 

 

I know!  It is a gifted program, but this is getting really hard.  This particular paper is a "math challenge" thing they do every week - not the regular math program.  They get a sheet on Monday and have to finish by Friday.  On top of that they have regular math - they're working on subtracting in the 100's while having to regroup twice - still pretty hard if you ask me!

2008-09-26 2:37 AM
in reply to: #1696882

User image

Master
2665
20005001002525
The Whites, New Hampshire
Subject: RE: Help needed with second grade math problem
JChristoff - 2008-09-25 4:44 PM

1 2 3

4 5 6

7 8 9


1) 7-8-9-6-3
2) 7-8-5-6-3
3) 7-8-5-2-3
4) 7-4-1-2-3
5) 7-4-5-2-3
6) 7-4-5-6-3
7) 7-8-5-4-1-2-3
8) 7-8-9-6-5-2-3
9) 7-8-9-6-5-4-1-2-3

Will the people who got ten explain how using this system? I'm still not seeing a tenth.

Love the parents of gifted kids giving them the answers. Gifted kids have a hard enough time with challenges (when almost everything comes so easily, it is way too tempting to steer clear of challenges), then to just get them out of the challenge they've intentionally entered! Gah! Speaking from far too much personal experience here.

2008-09-26 8:10 AM
in reply to: #1696882

User image

Member
70
2525
Toronto
Subject: RE: Help needed with second grade math problem

JChristoff - 2008-09-25 4:44 PM

1 2 3 4 5 6 7 8 9 1) 7-8-9-6-3 2) 7-8-5-6-3 3) 7-8-5-2-3 4) 7-4-1-2-3 5) 7-4-5-2-3 6) 7-4-5-6-3 7) 7-8-5-4-1-2-3 8) 7-8-9-6-5-2-3 9) 7-8-9-6-5-4-1-2-3

I Also get

10)7-4-1-2-5-8-9-6-3

11)7-4-5-8-9-6-3

12)7-4-1-2-5-6-3

2008-09-26 8:14 AM
in reply to: #1698043

User image

Elite
4504
20002000500
Columbus, Ohio
Subject: RE: Help needed with second grade math problem
arnoldro - 2008-09-26 9:10 AM

JChristoff - 2008-09-25 4:44 PM

1 2 3 4 5 6 7 8 9 1) 7-8-9-6-3 2) 7-8-5-6-3 3) 7-8-5-2-3 4) 7-4-1-2-3 5) 7-4-5-2-3 6) 7-4-5-6-3 7) 7-8-5-4-1-2-3 8) 7-8-9-6-5-2-3 9) 7-8-9-6-5-4-1-2-3

I Also get

10)7-4-1-2-5-8-9-6-3

11)7-4-5-8-9-6-3

12)7-4-1-2-5-6-3



Spider can't move down... Just up and across.
2008-09-26 8:32 AM
in reply to: #1696834

User image

Philadelphia, south of New York and north of DC
Subject: RE: Help needed with second grade math problem

puellasolis - Assuming that the spider can pass through each point only once (that is, he can't double back on a route), I get nine.

x2

Otherwise it's infinite. (or short of that depending on how long the spider lives)

7 8 9 8 7 8 9 6 3

7 8 9 8 7 8 9 8 7 8 9 6 3

7 8 9 8 7 8 9 8 7 8 9 8 7 8 9 6 3 ect.

 

 



Edited by dontracy 2008-09-26 8:32 AM
2008-09-26 8:41 AM
in reply to: #1697838

User image

Elite
3201
20001000100100
South Florida
Subject: RE: Help needed with second grade math problem

Slugger - 2008-09-26 3:37 AM
Love the parents of gifted kids giving them the answers. Gifted kids have a hard enough time with challenges (when almost everything comes so easily, it is way too tempting to steer clear of challenges), then to just get them out of the challenge they've intentionally entered! Gah! Speaking from far too much personal experience here.

 

I agree - for any kids, not just gifted programs.  Luckily the teachers usually know when kids are getting help from parents.  When I was a teacher we always knew which parents helped the kids on projects.  With these harder problems I try to guide her without giving the answer.  Like last week I taught her how to line up the decimal points when subtracting money, but after that I had her do the problem on her own.  It's hard to know when to stop guiding sometimes, though!

2008-09-26 8:55 AM
in reply to: #1698155

Iron Donkey
38643
50005000500050005000500050002000100050010025
, Wisconsin
Subject: RE: Help needed with second grade math problem
MomX3 - 2008-09-26 8:41 AM

Slugger - 2008-09-26 3:37 AM
Love the parents of gifted kids giving them the answers. Gifted kids have a hard enough time with challenges (when almost everything comes so easily, it is way too tempting to steer clear of challenges), then to just get them out of the challenge they've intentionally entered! Gah! Speaking from far too much personal experience here.

 

I agree - for any kids, not just gifted programs.  Luckily the teachers usually know when kids are getting help from parents.  When I was a teacher we always knew which parents helped the kids on projects.  With these harder problems I try to guide her without giving the answer.  Like last week I taught her how to line up the decimal points when subtracting money, but after that I had her do the problem on her own.  It's hard to know when to stop guiding sometimes, though!

My 6th grader has some "block" with reading comprehension, and is more of a visual learner, so I need to take a problem and draw up a visual thing for him.  Ex

A girl named Ava is 12.  She has two younger sisters, Bev who is 1 and Cathy who is 3.
Use (t-11) to represent Bev's age when Ava is "t" years old.

My boy wasn't grasping this algebraic word format, so I had to represent this on a number line (ray) for visual assistance:

-------|--------------|-----------------------------------------|-------------------->
        1                 3                                                  12
      BEV              CATHY                                           AVA
        ^                                                                      ^
         \___________________________________/
                                             |
                                        (t - 11), where Ava's age is "t" years old

I think he "grasped" the situation a little better.

Then there's (t - 11) + 2 to represent Cathy's age.

This problem was used to further develop the concept of "Order of Operations" - where you do your problem solving by doing:
1). Parentheses first
2). Powers
3). Multiply/divide from left to right
4). Addition/subtraction from left to right



Edited by 1stTimeTri 2008-09-26 8:55 AM

New Thread
Other Resources My Cup of Joe » Help needed with second grade math problem Rss Feed  
 
 
of 3